CN117578653A - Balanced regulation method and system for parallel circuit - Google Patents
Balanced regulation method and system for parallel circuit Download PDFInfo
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- CN117578653A CN117578653A CN202311519540.6A CN202311519540A CN117578653A CN 117578653 A CN117578653 A CN 117578653A CN 202311519540 A CN202311519540 A CN 202311519540A CN 117578653 A CN117578653 A CN 117578653A
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- 238000000034 method Methods 0.000 title claims abstract description 44
- 230000001105 regulatory effect Effects 0.000 claims abstract description 116
- 238000007599 discharging Methods 0.000 claims abstract description 67
- 230000002159 abnormal effect Effects 0.000 claims description 45
- 230000005856 abnormality Effects 0.000 claims description 14
- 230000009286 beneficial effect Effects 0.000 abstract description 6
- 239000003990 capacitor Substances 0.000 description 8
- 238000004146 energy storage Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The application discloses a balance adjustment method and a balance adjustment system for a parallel circuit, which belong to the field of batteries, and the method comprises the following steps: setting an equalization adjustment voltage value, a first voltage threshold value and a second voltage threshold value; acquiring real-time voltage value data of a plurality of battery packs in a parallel circuit to obtain different voltage value data; obtaining a high-voltage battery pack and a low-voltage battery pack based on the real-time voltage value data and the balanced regulation voltage values of the battery packs; calculating the voltage difference value between the real-time voltage value data of each battery pack and the balanced regulation voltage value; when the voltage difference value of the battery pack is larger than a first voltage threshold value, discharging the battery pack with a high voltage value in a specified time period through a preset voltage regulating circuit; when the voltage difference value of the battery pack is larger than a second voltage threshold value, charging the battery pack with a low voltage value in a specified time period through a preset voltage regulating circuit; the method has the advantage of being beneficial to realizing voltage balance of each battery pack of the parallel circuit to external output.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a balance adjustment method and system for a parallel circuit.
Background
Because of the limited capacity of the single cells, it is currently common practice to connect the single cells in series and parallel to obtain a high capacity battery pack. When the high-capacity and high-voltage battery packs are connected in parallel, due to the fact that the performance parameters of the battery packs are different, serious bias current and circulation current are generated among all parallel battery branches in the charging and discharging process, so that the battery discharging depth (DOD) of the parallel battery packs is different, the service life of the battery packs is influenced, and meanwhile, adverse effects on other auxiliary electric elements are also generated.
Therefore, the voltage of each battery pack of the parallel circuit to the external output is balanced through a proper control strategy, so that the service life of the battery packs of the parallel circuit is prolonged, and the method has practical application value and significance.
Disclosure of Invention
In order to equalize the voltages of the external outputs of the battery packs of the parallel circuit, the application provides an equalization adjustment method and an equalization adjustment system of the parallel circuit.
The first technical scheme adopted by the invention of the application is as follows:
a method of equalizing a parallel circuit, comprising:
setting an equalization adjustment voltage value, a first voltage threshold value and a second voltage threshold value; acquiring real-time voltage value data of a plurality of battery packs in a parallel circuit to obtain different voltage value data;
Obtaining a high-voltage-value battery pack and a low-voltage-value battery pack based on the real-time voltage value data and the balanced regulation voltage values of the plurality of battery packs; calculating the voltage difference value between the real-time voltage value data of each battery pack and the balanced regulation voltage value;
discharging the high-voltage battery pack in a specified time period through a preset voltage regulating circuit when the voltage difference value of the battery pack is larger than the first voltage threshold value;
and when the voltage difference value of the battery pack is larger than the second voltage threshold value, charging the battery pack with the low voltage value in a specified time period through a preset voltage regulating circuit.
By adopting the technical scheme, the balanced regulating voltage value is a given voltage balanced regulating point; the voltage regulating circuit capable of discharging and charging the plurality of battery packs is arranged in the battery packs of the parallel circuit, namely the battery packs with high voltage values are discharged through the voltage regulating circuit to reduce the voltage values, or the battery packs with low voltage values are charged through the voltage regulating circuit to raise the voltage values, so that the voltage balance of the plurality of battery packs is conveniently controlled and regulated, and the voltage balance regulating duration is controlled and regulated by setting the charging or discharging time; the condition of overcharging or undervoltage of the individual battery packs is effectively reduced; the effect of balancing the voltages of the external outputs of the battery packs of the parallel circuit is achieved.
In a preferred example, the present application: the first ends of the battery packs are connected with the voltage regulating circuit, the second ends of the battery packs are respectively connected with a group of charge and discharge selecting circuits and a control switch, the charge and discharge selecting circuits are connected with the control switch in parallel, and the charge and discharge selecting circuits are connected with the voltage regulating circuit;
the first voltage threshold includes a maximum discharge threshold and a minimum discharge threshold; the discharging of the battery pack with the high voltage value in a specified time period through a preset voltage regulating circuit specifically comprises the following steps:
when the voltage difference is larger than a maximum discharge threshold, the voltage regulating circuit discharges the high-voltage battery pack, and the control switch is in an off state;
and when the voltage difference value is smaller than a minimum discharge threshold value, the control switch is in a closed state.
By adopting the technical scheme, when the voltage difference of the battery pack is detected to need to be balanced, the control switch is turned off so as to realize balanced charge and discharge regulation of the battery pack, thereby being beneficial to reducing the situation that components are damaged due to larger impact current generated between the battery packs in the parallel circuit after overcurrent protection; specifically, when the voltage difference of the battery packs is larger than the maximum discharge threshold, the battery packs control the corresponding battery packs to be in a discharge mode through a charge-discharge selection circuit, and discharge operation is carried out on the battery packs with high voltage values; in the process of discharging operation, the voltage value of the battery pack is gradually reduced, the voltage difference value is reduced, when the voltage difference value is reduced to be smaller than the minimum discharging threshold value, the impact current at the moment is in a safe and controllable range, and the switch is controlled to be attracted to realize the parallel connection of a plurality of battery packs, so that the voltage balance adjustment of the battery packs in the parallel circuit is facilitated.
In a preferred example, the present application: after the real-time voltage value data of the plurality of battery packs in the parallel circuit are obtained, the method comprises the following steps:
the battery packs are associated with battery pack identifiers;
sending different real-time voltage value data to a preset regulation judgment model, and identifying and acquiring a regulation mode and a regulation time threshold corresponding to the voltage value data; the regulation mode comprises discharge regulation and charge regulation;
when the real-time voltage value data of a certain battery pack is not in the threshold value interval of the corresponding regulation mode, generating an abnormal message based on the battery pack identification corresponding to the real-time voltage value data, and sending the abnormal message to the cloud data terminal.
By adopting the technical scheme, the battery pack identification comprises the total capacity of the battery pack, the number of the contained single batteries, the battery model, the charge-discharge performance, the rated power and the like; the adjustment judgment model obtains corresponding charging time or discharging time based on the monitored voltage difference value, so that the charging time or discharging time for balanced adjustment of the voltage adjustment circuit is controlled; the service performance and the adjustment time of the battery pack can be changed along with the long-time use of the battery pack or due to the high-temperature use environment and other reasons; by means of timely monitoring the voltage values of the battery packs, when an abnormal condition such as overvoltage or undervoltage occurs to a certain battery pack (namely, the real-time voltage value data of the certain battery pack is not in the threshold value interval of the corresponding regulation mode), battery pack identification information of the corresponding battery pack is sent to a cloud data terminal (such as the cloud data terminal of a battery management system) so as to timely detect the abnormal condition of the battery pack in the parallel circuit, and battery pack maintenance and regulation measures are timely taken.
In a preferred example, the present application: after the adjustment mode and the adjustment time threshold corresponding to the voltage value data are identified and acquired, the method comprises the following steps:
sending a voltage regulation command to the voltage regulation circuit, and acquiring the actual regulation time of each battery pack based on the voltage regulation command;
the regulation judgment model compares the regulation time threshold value of each battery pack with an actual regulation time, compares the voltage difference value of each battery pack with a minimum discharge threshold value of a first voltage threshold value, or compares the voltage difference value of each battery pack with a minimum charge threshold value of a second voltage threshold value;
when discharging is regulated, if the regulating time threshold value of the battery pack is smaller than the actual regulating time and the voltage difference value of the battery pack is larger than the minimum discharging threshold value, generating an abnormal message;
or when the charging is regulated, if the regulating time threshold value of the battery pack is smaller than the actual regulating time and the voltage difference value of the battery pack is larger than the minimum charging threshold value, generating an abnormal message.
By adopting the technical scheme, the voltage regulating circuit starts balanced regulating operation after receiving the voltage regulating instruction; when the voltage regulating circuit regulates the voltage value of each battery pack to a specified balanced regulating voltage value, the actual regulating time of each battery pack is counted; comparing the value of the adjustment time threshold with the value of the actual adjustment time, wherein the actual adjustment time is longer than the adjustment time threshold, which represents that the required adjustment time is longer; and during discharge adjustment, if the voltage difference of the battery pack is still greater than the minimum discharge threshold, the battery pack is abnormal, which indicates that discharge equalization operation is still required; or during charging adjustment, if the voltage difference value of the battery pack is still smaller than the minimum charging threshold value, the battery pack is abnormal, wherein the battery pack still needs to be subjected to charging equalization operation; thereby being convenient for finding out the battery pack with abnormal battery parameters in time.
In a preferred example, the present application: after sending the voltage regulation command to the voltage regulation circuit, the method comprises the following steps of
Generating an adjustment record list based on the voltage adjustment instruction, and calculating an adjustment charging frequency and an adjustment discharging frequency of each battery pack;
generating an abnormal message and transmitting the abnormal message to a cloud data terminal in combination with a battery pack identifier when the adjusted charging frequency or the adjusted discharging frequency is larger than a preset frequency critical value and smaller than a preset frequency limit value;
and when the regulated charging frequency or the regulated discharging frequency is larger than a preset frequency limit value, sending a replacement prompt and a battery pack identification to the cloud data terminal.
By adopting the technical scheme, the adjustment record list is used for counting and recording the equalization adjustment information and the specifically adjusted battery pack, and the adjustment charge frequency and the adjustment discharge frequency of the equalization adjustment of the same battery pack are counted based on the adjustment record list; the frequency limit value is the adjustment limit frequency of the same battery pack for carrying out balanced adjustment under the normal service life; when the charging frequency is regulated or the discharging frequency is regulated to be larger than a preset frequency critical value and smaller than a preset frequency limit value, the battery performance of the battery pack is greatly reduced, at the moment, a user is prompted to judge whether the battery pack needs to be replaced according to the service condition; when the charging frequency is regulated or the discharging frequency is regulated to be larger than a preset frequency limit value, the battery performance of the battery pack is seriously reduced, and the battery pack needs to be replaced in time; thereby facilitating monitoring and management of the parallel circuit.
The second object of the present application is achieved by the following technical scheme:
a parallel circuit equalization adjustment system for performing the parallel circuit equalization adjustment method according to any one of the above, comprising:
the data setting and acquiring module is used for setting an equalization adjusting voltage value, a first voltage threshold value and a second voltage threshold value; acquiring real-time voltage value data of a plurality of battery packs in a parallel circuit to obtain different voltage value data;
the battery pack dividing module is used for obtaining a high-voltage battery pack and a low-voltage battery pack based on the real-time voltage value data and the balanced regulation voltage values of the plurality of battery packs; calculating the voltage difference value between the real-time voltage value data of each battery pack and the balanced regulation voltage value;
the discharging adjusting module is used for discharging the high-voltage value battery pack in a specified time period through a preset voltage adjusting circuit when the voltage difference value of the battery pack is larger than the first voltage threshold value;
and the charging regulation module is used for charging the low-voltage value battery pack in a specified time period through a preset voltage regulation circuit when the voltage difference value of the battery pack is larger than the second voltage threshold value.
By adopting the technical scheme, the balanced regulating voltage value is a given voltage balanced regulating point; a voltage regulating circuit capable of discharging and charging a plurality of battery packs is arranged in the battery packs of the parallel circuit, and after the battery pack dividing module divides the battery packs with high voltage value and the battery packs with low voltage value, the battery packs with high voltage value are discharged through the discharging regulating module of the voltage regulating circuit so as to reduce the voltage value; or charging the battery pack with a low voltage value through a charging regulation module of the voltage regulation circuit so as to increase the voltage value; thereby facilitating the control and adjustment of the voltage balance of the plurality of battery packs, and controlling and adjusting the voltage balance adjustment time length by making charge or discharge time; the condition of overcharging or undervoltage of the individual battery packs is effectively reduced; the effect of balancing the voltages of the external outputs of the battery packs of the parallel circuit is achieved.
In a preferred example, the present application: further comprises:
the identification module is used for associating battery pack identifications with a plurality of battery packs;
the adjusting judging module is used for sending different real-time voltage value data to a preset adjusting judging model, and identifying and acquiring an adjusting mode and an adjusting time threshold corresponding to the voltage value data; the regulation mode comprises discharge regulation and charge regulation;
and the abnormality prompting module is used for generating an abnormality message based on the battery pack identifier corresponding to the real-time voltage value data of a certain battery pack when the real-time voltage value data of the battery pack is not in the threshold interval of the corresponding regulation mode and sending the abnormality message to the cloud data terminal.
By adopting the technical scheme, the battery pack identification is used for recording the battery performance of each battery pack and distinguishing and marking a plurality of battery packs; the adjustment judgment model obtains corresponding charging time or discharging time based on the monitored voltage difference value, so that the charging time or discharging time for balanced adjustment of the voltage adjustment circuit is controlled; the service performance and the adjustment time of the battery pack can be changed along with the long-time use of the battery pack or due to the high-temperature use environment and other reasons; by means of timely monitoring the voltage value of the battery pack, when an abnormal condition such as overvoltage or undervoltage occurs to a certain battery pack when the voltage is too low, the voltage is too high or the battery pack is used (namely, the real-time voltage value data of the certain battery pack is not in the threshold value interval of the corresponding regulation mode), the abnormal prompt module sends battery pack identification information and abnormal information of the corresponding battery pack to a cloud data terminal (such as the cloud data terminal of a battery management system) so as to timely detect the abnormal condition of the battery pack in the parallel circuit and timely take battery pack maintenance and regulation measures.
In a preferred example, the present application: the adjustment judging module includes:
the time acquisition sub-module is used for sending a voltage regulation command to the voltage regulation circuit and acquiring the actual regulation time of each battery pack based on the voltage regulation command;
the numerical comparison sub-module is used for comparing the adjustment time threshold value of each battery pack with the actual adjustment time by the adjustment judgment model, comparing the voltage difference value of each battery pack with the minimum discharge threshold value of the first voltage threshold value or comparing the voltage difference value of each battery pack with the minimum charge threshold value of the second voltage threshold value;
the abnormal prompting submodule is used for generating an abnormal message when discharging is regulated if the regulating time threshold value of the battery pack is smaller than the actual regulating time and the voltage difference value of the battery pack is larger than the minimum discharging threshold value;
or when the charging is regulated, if the regulating time threshold value of the battery pack is smaller than the actual regulating time and the voltage difference value of the battery pack is larger than the minimum charging threshold value, generating an abnormal message.
By adopting the technical scheme, the voltage regulating circuit starts balanced regulating operation after receiving the voltage regulating instruction; the time acquisition sub-module counts the actual adjustment time of each battery pack when the voltage value of the battery pack is adjusted to a specified balanced adjustment voltage value by the voltage adjustment circuit; the numerical comparison submodule compares the value of the adjustment time threshold value with the value of the actual adjustment time, and the actual adjustment time is longer than the adjustment time threshold value, which represents that the required adjustment time is longer; and during discharge adjustment, if the voltage difference of the battery pack is still greater than the minimum discharge threshold, the battery pack is abnormal, which indicates that discharge equalization operation is still required; or during charging adjustment, if the voltage difference value of the battery pack is still smaller than the minimum charging threshold value, the battery pack is abnormal, wherein the battery pack still needs to be subjected to charging equalization operation; the abnormal message of the regulation judging module is convenient for finding out the battery pack with abnormal battery parameters in time.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the balance adjustment voltage value is a given voltage balance adjustment point; the voltage regulating circuit capable of discharging and charging the plurality of battery packs is arranged in the battery packs of the parallel circuit, namely the battery packs with high voltage values are discharged through the voltage regulating circuit to reduce the voltage values, or the battery packs with low voltage values are charged through the voltage regulating circuit to raise the voltage values, so that the voltage balance of the plurality of battery packs is conveniently controlled and regulated, and the voltage balance regulating duration is controlled and regulated by setting the charging or discharging time; the condition of overcharging or undervoltage of the individual battery packs is effectively reduced; the effect of balancing the voltages of the external outputs of the battery packs of the parallel circuit is realized;
2. when detecting that the voltage difference of the battery pack needs to be balanced, the control switch is turned off so as to realize balanced charge and discharge adjustment of the battery pack, thereby being beneficial to reducing the situation that components are damaged due to larger impact current generated between the battery packs in the parallel circuit after overcurrent protection; specifically, when the voltage difference of the battery pack is larger than the maximum discharge threshold, the battery pack controls the connected battery pack to be in a discharge mode through the charge-discharge selection circuit, and performs discharge operation for the battery pack with high voltage value; in the process of discharging operation, the voltage value of the battery pack is gradually reduced, the voltage difference value is reduced, when the voltage difference value is reduced to be smaller than the minimum discharging threshold value, the impact current at the moment is in a safe controllable range, and the switch is controlled to be attracted to realize the parallel connection of a plurality of battery packs, so that the voltage balance adjustment of the battery packs in the parallel circuit is facilitated;
3. Counting and recording equalization adjustment information and a specific adjusted battery pack through an adjustment record list, and counting the equalization adjustment charging frequency and the equalization adjustment discharging frequency of the same battery pack based on the adjustment record list; the frequency limit value is the adjustment limit frequency of the same battery pack for carrying out balanced adjustment under the normal service life; when the charging frequency is adjusted or the discharging frequency is adjusted to be larger than a preset frequency critical value and smaller than a preset frequency limit value, the battery performance of the battery pack is greatly reduced, and a user is prompted that the battery performance of the battery pack is poor; when the charging frequency is regulated or the discharging frequency is regulated to be larger than a preset frequency limit value, the battery performance of the battery pack is seriously reduced, and a user judges whether the battery pack needs to be replaced according to the use condition, so that the parallel circuit is convenient to monitor and manage.
Drawings
FIG. 1 is a flow chart of a method of equalizing a parallel circuit in an embodiment of the present application;
FIG. 2 is a schematic diagram of an equalization adjusting circuit in an equalization adjusting method of a parallel circuit according to an embodiment of the present application;
FIG. 3 is a flowchart of step S3 in a method for equalizing a parallel circuit according to an embodiment of the present application;
Fig. 4 is a flowchart after step S1 in a method for equalizing a parallel circuit according to an embodiment of the present application;
fig. 5 is a flowchart after step S12 in the method for equalizing the parallel circuit according to an embodiment of the present application;
fig. 6 is a flowchart after step S121 in the equalization adjustment method of the parallel circuit according to an embodiment of the present application.
Detailed Description
The present application is described in further detail below with reference to the accompanying drawings.
In one embodiment, as shown in fig. 1, the application discloses a method for equalizing and adjusting a parallel circuit, which specifically includes the following steps:
s1: setting an equalization adjustment voltage value, a first voltage threshold value and a second voltage threshold value; and acquiring real-time voltage value data of a plurality of battery packs in a parallel circuit to obtain different voltage value data.
In this embodiment, the equalization adjustment voltage value is equalization adjustment voltage data of each battery pack in the circuit; the first voltage threshold is a discharge voltage threshold; the second voltage threshold is a charging voltage threshold.
S2: obtaining a high-voltage battery pack and a low-voltage battery pack based on the real-time voltage value data and the balanced regulation voltage values of the battery packs; and calculating the voltage difference between the real-time voltage value data of each battery pack and the balanced regulation voltage value.
In this embodiment, the battery pack with the real-time voltage value data larger than the equilibrium regulating voltage value is divided into the high-voltage value battery packs, and the battery pack with the real-time voltage value data smaller than the equilibrium regulating voltage value is divided into the low-voltage value battery packs.
S3: and when the voltage difference value of the battery pack is larger than the first voltage threshold value, discharging the battery pack with a high voltage value in a specified time period through a preset voltage regulating circuit.
In this embodiment, the voltage difference of the battery pack is determined from the first voltage threshold and the second voltage threshold.
Specifically, the voltage regulating circuit specifically includes a discharge regulating circuit and a charge regulating circuit; when actually connected, the parallel circuit comprises a voltage regulating circuit, and the voltage regulating circuit is provided with a voltage selecting unit; the first ends of the battery packs are commonly connected with a voltage regulating circuit, the second ends of the battery packs are respectively connected with a group of control switches and a voltage selecting unit, and the voltage selecting unit is connected with the control switches in parallel; the high-voltage output end and the low-voltage output end of the voltage selection unit are respectively connected with the voltage regulating circuit; when the control switch is closed, the parallel connection of a plurality of battery packs is realized.
Specifically, taking three battery packs as an example shown in fig. 2, the voltage regulating circuit comprises a MOS tube, an energy storage capacitor C1 and a current storage diode D7, and the control switches are K1, K2 and K3; the voltage selection unit is composed of two diodes which are connected in anti-parallel, each diode is connected in series with a switch, and the voltage selection unit of FIG. 1 is arranged one by one corresponding to three battery packs, and 3 groups are all provided; specifically, the voltage selection units of the battery pack 1 are D1 and D2, the voltage selection units of the battery pack 2 are D3 and D4, and the voltage selection units of the battery pack 3 are D5 and D6; when the MOS tube is conducted, the high-voltage battery pack, the energy storage capacitor C1, the current storage diode D7 and the high-voltage output end (corresponding switch is closed) of the voltage selection unit are conducted, and at the moment, the discharge switch K7 is disconnected; the voltage regulating circuit forms a discharging loop of the discharging regulating circuit, and the voltage regulating circuit discharges the high-voltage battery pack to charge the energy storage capacitor C1.
Further, the voltage difference of the battery packs is greater than the first voltage threshold, the voltage imbalance problem exists in the multi-battery pack, if the control switches K1, K2 and K3 are kept closed at this time, a larger impact current exists between the battery packs, so that the problem of overcurrent protection or damage to circuit components occurs, the corresponding control switches (K1, K2 and K3) of the battery packs with high voltage values are disconnected, a voltage regulating circuit is started, and the battery packs with high voltage values charge the energy storage capacitor C1, for example, when the voltage value of the battery packs 1 is higher, the corresponding control switch K1 is disconnected.
S4: and when the voltage difference value of the battery pack is larger than the second voltage threshold value, charging the battery pack with a low voltage value in a specified time period through a preset voltage regulating circuit.
In this embodiment, when the voltage difference of the battery pack is greater than the second voltage threshold, the voltage of the multiple battery packs is unbalanced, and the voltage value of the battery pack is low, at this time, the voltage control circuit controls the control switch and the MOS transistor of the battery pack to be opened, and the low-voltage output ends (switch of the branch is closed) of the low-voltage battery pack, the energy storage capacitor C1, the current storage diode D7 and the voltage selection unit of the battery pack are turned on, and at this time, the discharge switch K7 is turned on; and the charging regulation circuit is conducted, the energy storage capacitor C1 in the voltage regulation circuit charges the battery pack with a low voltage value, and discharging operation is realized on the energy storage capacitor C1.
Further, when the charge regulation equalizing operation is performed, the corresponding control switch of the low-voltage battery pack is turned off, the voltage regulating circuit is started, and the high-voltage battery pack discharges the energy storage capacitor C1, for example, when the voltage value of the battery pack 1 is higher, the corresponding control switch K1 is turned off.
In one embodiment, as shown in fig. 3, in step S3, the first voltage threshold includes a maximum discharge threshold and a minimum discharge threshold; discharging the battery pack with a high voltage value in a specified time period through a preset voltage regulating circuit; the method specifically comprises the following steps:
s31: when the voltage difference is larger than the maximum discharge threshold, the voltage regulating circuit discharges the high-voltage battery pack, and the control switch is in an off state.
In this embodiment, when the voltage difference is greater than the maximum discharge threshold, it indicates that the parallel circuit has a battery pack with a higher voltage value, and the voltages among the battery packs are unbalanced, so that the battery pack needs to be discharged, and discharging in a specified time period is beneficial to controlling the discharge or stopping the discharge of the battery pack with a high voltage value, so as to control the balance adjustment operation.
Specifically, when the control switch is in an off state, it means that the parallel connection of the plurality of battery packs is temporarily disconnected when the equalization adjustment operation of the plurality of battery packs is performed, so as to reduce the occurrence of a situation that a large impact current is generated among the plurality of battery packs to damage components.
S32: and when the voltage difference value is smaller than the minimum discharge threshold value, the control switch is in a closed state.
Specifically, in the process of performing discharging operation, the voltage value of the high-voltage battery pack is gradually reduced, the voltage difference value is reduced, when the voltage difference value is reduced to be smaller than the minimum discharging threshold value, the impact current at the moment is indicated to be in a safe and controllable range, at the moment, the control switch is controlled to be attracted to achieve parallel connection of a plurality of battery packs, and the voltage balance adjustment operation of discharging balance of the high-voltage battery pack in the parallel circuit is facilitated.
In the present embodiment, in step S4, the second voltage threshold includes a maximum charge threshold and a minimum charge threshold; charging the low-voltage battery pack in a specified time period through a preset voltage regulating circuit, specifically comprising:
s33: when the voltage difference is larger than the maximum charging threshold, the voltage regulating circuit charges the low-voltage battery pack, and the control switch is in an off state.
Specifically, when the voltage difference is greater than the maximum charging threshold, it indicates that a battery pack with a lower voltage value appears in the parallel circuit, and the voltages among the battery packs are unbalanced, so that the battery pack needs to be charged, and charging in a specified time period is beneficial to controlling charging or stopping charging of the battery pack with a low voltage value, so that the balance adjustment operation is convenient to control.
Specifically, when the control switch is in an off state, the parallel connection of the plurality of battery packs is temporarily disconnected when the balance adjustment operation of the plurality of battery packs is performed, so that the situation that a large impact current is generated among the plurality of battery packs to damage components is reduced.
S34: and when the voltage difference is smaller than the minimum charging threshold, the control switch is in a closed state.
Specifically, in the process of performing charging operation, the voltage value of the low-voltage battery pack is gradually increased, the voltage difference value is reduced, when the voltage difference value is reduced to be smaller than the minimum charging threshold value, the impact current at the moment is indicated to be in a safe and controllable range, and at the moment, the control switch is controlled to be attracted to achieve parallel connection of a plurality of battery packs, so that the voltage balance adjustment operation of charging balance of the low-voltage battery pack in the parallel circuit is facilitated.
In an embodiment, as shown in fig. 4, after acquiring real-time voltage value data of a plurality of battery packs in the parallel circuit in step S1, the method for equalizing and adjusting the parallel circuit further includes:
s11: the battery packs are associated with battery pack identifications.
Specifically, the battery pack identifier comprises the total capacity of the battery pack, the number of the contained single batteries, the type of the battery, the charge-discharge performance, the rated power and the like; the battery pack identification comprises a plurality of serial number identifications which are sequentially arranged in the battery pack.
S12: sending different real-time voltage value data to a preset regulation judgment model, and identifying and acquiring a regulation mode and a regulation time threshold corresponding to the voltage value data; the regulation modes include discharge regulation and charge regulation.
In this embodiment, the adjustment judgment model is a threshold interval for performing charge-discharge balance adjustment when there is a voltage difference between a battery pack with multiple types and multiple capacities, and the threshold interval refers to an adjustment mode and an adjustment time threshold under the condition of balance adjustment, for example, when the voltage difference between a battery pack with a low voltage value and a balance adjustment voltage value is 0.4V, the time for performing charge balance adjustment is 50 to 100 minutes based on the adjustment time threshold of the battery pack with type a under the condition of normal service life of the battery pack through multiple experimental statistics; the battery pack adjustment mode of model a is charge adjustment, and the corresponding adjustment time threshold is 50 to 100 minutes, which is considered as normal.
Specifically, the obtained different real-time voltage value data are sent to an adjustment judgment model, and the adjustment judgment model identifies an adjustment mode and an adjustment time threshold value which are corresponding to the equalization processing based on a voltage difference value of the equalization adjustment voltage value set by identifying whether the battery pack is in a high-voltage state or a low-voltage state; so as to observe the actual equalization adjustment time of the battery pack at the time of equalization adjustment.
S13: when the real-time voltage value data of a certain battery pack is not in the threshold value interval of the corresponding regulation mode, generating an abnormal message based on the battery pack identification corresponding to the real-time voltage value data, and sending the abnormal message to the cloud data terminal.
In this embodiment, the adjustment judgment model is set with a certain voltage difference range based on the rated power of the battery pack and the specified equilibrium adjustment voltage value, and the adjustment judgment model is stored in the database of the battery management system; the cloud data terminal is a battery management system cloud terminal.
Specifically, the battery pack may not be durable during use, the voltage is boosted faster in the same time during charging, and the like, so when the voltage of the real-time voltage value data of a certain battery pack is too low or too high, that is, the real-time voltage value data of the battery pack is not within the threshold interval of the corresponding regulation mode, the battery pack is indicated to be abnormal at the moment, and the user can replace the battery pack according to the use condition by generating an abnormal message so as to be convenient for the user to identify the battery pack with the specific abnormality.
In one embodiment, as shown in fig. 5, after identifying and acquiring the adjustment mode and the adjustment time threshold corresponding to the voltage value data in step S12, the method for equalizing the parallel circuit further includes:
S121: and sending a voltage regulation command to the voltage regulation circuit, and acquiring the actual regulation time of each battery pack based on the voltage regulation command.
In this embodiment, the voltage adjustment command is a command sent by the power management system to the voltage adjustment circuit for performing balance adjustment. The actual adjustment time is the time taken by the voltage adjustment circuit to balance and adjust the voltage values of the high-voltage value battery pack and the low-voltage value battery pack to the specified balance adjustment voltage value. The actual regulating time is regulated to screen the battery pack with abnormal battery performance and too short or too long regulating time.
S122: the adjustment judgment model compares the adjustment time threshold value of each battery pack with the actual adjustment time, compares the voltage difference value of each battery pack with the minimum discharge threshold value of the first voltage threshold value, or compares the voltage difference value of each battery pack with the minimum charge threshold value of the second voltage threshold value.
Specifically, comparing the value of the adjustment time threshold with the value of the actual adjustment time, wherein the maximum time that the actual adjustment time is longer than the adjustment time threshold represents a longer adjustment time; or, the actual adjustment time is shorter than the shortest time of the adjustment time threshold, representing that the required adjustment time is shorter, at which time there may be an abnormality in the battery pack.
S123: and when the discharge is regulated, if the regulating time threshold value of the battery pack is smaller than the actual regulating time and the voltage difference value of the battery pack is larger than the minimum discharging threshold value, generating an abnormal message.
Specifically, whether the actual equalization adjustment time of the battery pack is too long or too short is abnormal or not is judged; then further judge: if the voltage difference of the battery pack is still greater than the minimum discharge threshold, the battery pack is abnormal, and the battery pack is required to be subjected to discharge equalization operation.
S124: or when the charging is regulated, if the regulating time threshold value of the battery pack is smaller than the actual regulating time and the voltage difference value of the battery pack is larger than the minimum charging threshold value, generating an abnormal message.
Specifically, further judgment: if the voltage difference of the battery pack is still larger than the minimum discharge threshold, the battery pack is required to be subjected to discharge balancing operation, an abnormality exists in the battery pack, and an abnormality message is generated to prompt a worker that the performance of the battery pack is seriously reduced at the moment.
In an embodiment, as shown in fig. 6, after step S121, the equalization adjustment method of the parallel circuit further includes:
s1211: an adjustment record list is generated based on the voltage adjustment instructions, and an adjustment charging frequency and an adjustment discharging frequency of each battery pack are calculated.
In this embodiment, the adjustment record list is used to record the battery pack mark and the time when the voltage adjustment command is sent, that is, the voltage value monitoring information of the battery pack is recorded; and the regulation record list records the balance regulation process of the parallel circuit, the voltage change process of each balance regulation, the voltage regulation threshold value and the balance regulation actual time. The charging frequency is adjusted to the total charging frequency from the start of the use of the plurality of battery packs to the end of the use, and the discharging frequency is adjusted to the total discharging frequency from the start of the use of the plurality of battery packs to the end of the use.
Specifically, each battery pack is recorded with an adjustment charging frequency and an adjustment discharging frequency, the battery management system side displays and records the equalization adjustment frequency of the battery pack, and performs multi-view-port adjustment frequency display based on the battery pack identification so as to detect the equalization adjustment recording and the change process of each battery pack.
S1212: and when the charging frequency is regulated or the discharging frequency is regulated to be larger than a preset frequency critical value and smaller than a preset frequency limit value, generating an abnormal message and transmitting the abnormal message to the cloud data terminal in combination with the battery pack identifier.
Specifically, when the adjusted charging frequency or the adjusted discharging frequency of a certain battery pack is greater than the frequency critical value and less than the frequency limit value, the battery performance of the battery pack is greatly reduced, and a user or a tester can judge whether the battery pack needs to be replaced or not based on the actual use condition; and sending the battery pack identification corresponding to the battery pack to a terminal of the battery management system to carry out abnormality prompt.
S1213: and when the charging frequency is regulated or the discharging frequency is regulated to be larger than a preset frequency limit value, sending a replacement prompt and a battery pack identifier to the cloud data terminal.
In this embodiment, when the adjusted charging frequency or the adjusted discharging frequency of a certain battery pack is greater than the frequency limit value, it indicates that the battery performance of the battery pack is severely degraded, and the remaining service life is short, so that the battery pack needs to be replaced in time; and sending the battery pack identification corresponding to the battery pack to a terminal of the battery management system to carry out replacement prompt.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic of each process, and should not limit the implementation process of the embodiment of the present application in any way.
In one embodiment, an equalization adjustment system of a parallel circuit is provided, which corresponds to the equalization adjustment method of a parallel circuit in the above embodiment.
The balance adjusting system of the parallel circuit comprises a data setting and acquiring module, a battery pack dividing module, a discharging adjusting module and a charging adjusting module. The detailed description of each functional module is as follows:
The data setting and acquiring module is used for setting an equalization adjusting voltage value, a first voltage threshold value and a second voltage threshold value; acquiring real-time voltage value data of a plurality of battery packs in a parallel circuit to obtain different voltage value data;
the battery pack dividing module is used for obtaining a high-voltage battery pack and a low-voltage battery pack based on the real-time voltage value data and the balanced regulation voltage values of the plurality of battery packs; calculating the voltage difference value between the real-time voltage value data of each battery pack and the balanced regulation voltage value;
the discharging adjusting module is used for discharging the battery pack with the high voltage value in a specified time period through a preset voltage adjusting circuit when the voltage difference value of the battery pack is larger than a first voltage threshold value;
and the charging regulation module is used for charging the low-voltage battery pack in a specified time period through a preset voltage regulation circuit when the voltage difference value of the battery pack is larger than the second voltage threshold value.
Optionally, the equalization adjusting system of the parallel circuit further includes:
the identification module is used for associating battery pack identifications with a plurality of battery packs;
the adjusting judging module is used for sending different real-time voltage value data to a preset adjusting judging model, and identifying and acquiring an adjusting mode and an adjusting time threshold corresponding to the voltage value data; the regulation mode includes discharge regulation and charge regulation;
And the abnormality prompting module is used for generating an abnormality message based on the battery pack identifier corresponding to the real-time voltage value data of a certain battery pack when the real-time voltage value data of the battery pack is not in the threshold interval of the corresponding regulation mode and sending the abnormality message to the cloud data terminal.
Optionally, the adjustment judging module includes:
the time acquisition sub-module is used for sending a voltage regulation command to the voltage regulation circuit and acquiring the actual regulation time of each battery pack based on the voltage regulation command;
the numerical comparison sub-module is used for comparing the adjustment time threshold value of each battery pack with the actual adjustment time by the adjustment judgment model, comparing the voltage difference value of each battery pack with the minimum discharge threshold value of the first voltage threshold value or comparing the voltage difference value of each battery pack with the minimum charge threshold value of the second voltage threshold value;
the abnormal prompting submodule is used for generating an abnormal message when discharging is regulated if the regulating time threshold value of the battery pack is smaller than the actual regulating time and the voltage difference value of the battery pack is larger than the minimum discharging threshold value;
or when the charging is regulated, if the regulating time threshold value of the battery pack is smaller than the actual regulating time and the voltage difference value of the battery pack is larger than the minimum charging threshold value, generating an abnormal message.
For specific limitations of the equalization adjustment system of the parallel circuit, reference may be made to the above limitation of the equalization adjustment method of the parallel circuit, and no further description is given here; all or part of each module in the balance adjustment system of the parallel circuit can be realized by software, hardware and a combination thereof; the above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand; the technical scheme described in the foregoing embodiments can be modified or some of the features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (8)
1. A method for equalizing a parallel circuit, comprising:
Setting an equalization adjustment voltage value, a first voltage threshold value and a second voltage threshold value; acquiring real-time voltage value data of a plurality of battery packs in a parallel circuit to obtain different voltage value data;
obtaining a high-voltage-value battery pack and a low-voltage-value battery pack based on the real-time voltage value data and the balanced regulation voltage values of the plurality of battery packs; calculating the voltage difference value between the real-time voltage value data of each battery pack and the balanced regulation voltage value;
discharging the high-voltage battery pack in a specified time period through a preset voltage regulating circuit when the voltage difference value of the battery pack is larger than the first voltage threshold value;
and when the voltage difference value of the battery pack is larger than the second voltage threshold value, charging the battery pack with the low voltage value in a specified time period through a preset voltage regulating circuit.
2. The method for equalizing a parallel circuit according to claim 1, wherein,
the first ends of the battery packs are connected with the voltage regulating circuit, the second ends of the battery packs are respectively connected with a group of charge and discharge selecting circuits and a control switch, the charge and discharge selecting circuits are connected with the control switch in parallel, and the charge and discharge selecting circuits are connected with the voltage regulating circuit;
The first voltage threshold includes a maximum discharge threshold and a minimum discharge threshold; the discharging of the battery pack with the high voltage value in a specified time period through a preset voltage regulating circuit specifically comprises the following steps:
when the voltage difference is larger than a maximum discharge threshold, the voltage regulating circuit discharges the high-voltage battery pack, and the control switch is in an off state;
and when the voltage difference value is smaller than a minimum discharge threshold value, the control switch is in a closed state.
3. The method for equalizing a parallel circuit according to claim 1, wherein after obtaining real-time voltage value data of a plurality of battery packs in the parallel circuit, the method comprises:
the battery packs are associated with battery pack identifiers;
sending different real-time voltage value data to a preset regulation judgment model, and identifying and acquiring a regulation mode and a regulation time threshold corresponding to the voltage value data; the regulation mode comprises discharge regulation and charge regulation;
when the real-time voltage value data of a certain battery pack is not in the threshold value interval of the corresponding regulation mode, generating an abnormal message based on the battery pack identification corresponding to the real-time voltage value data, and sending the abnormal message to the cloud data terminal.
4. The method for equalizing a parallel circuit according to claim 3, wherein after said identifying and acquiring the adjustment pattern and the adjustment time threshold corresponding to the voltage value data, comprising:
sending a voltage regulation command to the voltage regulation circuit, and acquiring the actual regulation time of each battery pack based on the voltage regulation command;
the regulation judgment model compares the regulation time threshold value of each battery pack with an actual regulation time, compares the voltage difference value of each battery pack with a minimum discharge threshold value of a first voltage threshold value, or compares the voltage difference value of each battery pack with a minimum charge threshold value of a second voltage threshold value;
when discharging is regulated, if the regulating time threshold value of the battery pack is smaller than the actual regulating time and the voltage difference value of the battery pack is larger than the minimum discharging threshold value, generating an abnormal message;
or when the charging is regulated, if the regulating time threshold value of the battery pack is smaller than the actual regulating time and the voltage difference value of the battery pack is larger than the minimum charging threshold value, generating an abnormal message.
5. The method according to claim 4, wherein after the voltage adjustment command is sent to the voltage adjustment circuit, comprising
Generating an adjustment record list based on the voltage adjustment instruction, and calculating an adjustment charging frequency and an adjustment discharging frequency of each battery pack;
generating an abnormal message and transmitting the abnormal message to a cloud data terminal in combination with a battery pack identifier when the adjusted charging frequency or the adjusted discharging frequency is larger than a preset frequency critical value and smaller than a preset frequency limit value;
and when the regulated charging frequency or the regulated discharging frequency is larger than a preset frequency limit value, sending a replacement prompt and a battery pack identification to the cloud data terminal.
6. A parallel circuit equalization adjustment system for performing the parallel circuit equalization adjustment method of any of claims 1-5, comprising:
the data setting and acquiring module is used for setting an equalization adjusting voltage value, a first voltage threshold value and a second voltage threshold value; acquiring real-time voltage value data of a plurality of battery packs in a parallel circuit to obtain different voltage value data;
the battery pack dividing module is used for obtaining a high-voltage battery pack and a low-voltage battery pack based on the real-time voltage value data and the balanced regulation voltage values of the plurality of battery packs; calculating the voltage difference value between the real-time voltage value data of each battery pack and the balanced regulation voltage value;
The discharging adjusting module is used for discharging the high-voltage value battery pack in a specified time period through a preset voltage adjusting circuit when the voltage difference value of the battery pack is larger than the first voltage threshold value;
and the charging regulation module is used for charging the low-voltage value battery pack in a specified time period through a preset voltage regulation circuit when the voltage difference value of the battery pack is larger than the second voltage threshold value.
7. The parallel circuit equalization adjustment system of claim 6, further comprising:
the identification module is used for associating battery pack identifications with a plurality of battery packs;
the adjusting judging module is used for sending different real-time voltage value data to a preset adjusting judging model, and identifying and acquiring an adjusting mode and an adjusting time threshold corresponding to the voltage value data; the regulation mode comprises discharge regulation and charge regulation;
and the abnormality prompting module is used for generating an abnormality message based on the battery pack identifier corresponding to the real-time voltage value data of a certain battery pack when the real-time voltage value data of the battery pack is not in the threshold interval of the corresponding regulation mode and sending the abnormality message to the cloud data terminal.
8. The parallel circuit equalization adjustment system of claim 7, wherein the adjustment determination module comprises:
The time acquisition sub-module is used for sending a voltage regulation command to the voltage regulation circuit and acquiring the actual regulation time of each battery pack based on the voltage regulation command;
the numerical comparison sub-module is used for comparing the adjustment time threshold value of each battery pack with the actual adjustment time by the adjustment judgment model, comparing the voltage difference value of each battery pack with the minimum discharge threshold value of the first voltage threshold value or comparing the voltage difference value of each battery pack with the minimum charge threshold value of the second voltage threshold value;
the abnormal prompting submodule is used for generating an abnormal message when discharging is regulated if the regulating time threshold value of the battery pack is smaller than the actual regulating time and the voltage difference value of the battery pack is larger than the minimum discharging threshold value;
or when the charging is regulated, if the regulating time threshold value of the battery pack is smaller than the actual regulating time and the voltage difference value of the battery pack is larger than the minimum charging threshold value, generating an abnormal message.
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